Authored by: Support.com Tech Pro Team
Boot issues happen when your computer will not power on, or you hear beeping when you power on the device. This guide will cover some troubleshooting steps to help you with these issues.
When you turn on the computer it will perform some tests before it loads the operating system. If you hear beeping when you turn on your computer you likely have a hardware issue.
BeepsIssueServiceRequiredNoneThis happens either due to no power to the system and your battery is dead. There is some situations you may be able to reset the NVRAM or SMC to resolve the issue.MaybeOneThis happens when your computer doesn't detect any RAM in your computer.YesTwoThis usually happens when you install the wrong type of RAM in your computer. If you attempted a RAM upgrade on your own or at a repair center, it may not have the right type of ram installed.YesThreeThis usually happens when RAM isn't seated well into your computer or you have a bad / faulty stick of RAM in the computer.YesFourThe system is unable to find a boot image. This can be indication of a faulty or corrupt hard drive. If you have your macOS install media, you may be able to boot to that media and repair your disk.MaybeFiveUsually when you get this code, your computer is having issues communicating between the CPU and the motherboard.Yes
There are two ways to power up a MacBook:
If you computer will not respond to any input and appears frozen, press and hold on the Power button until the computer shuts off.
The power button on a Macbook is typically located on or near the keyboard while the power button on a Mac Pro will vary depending on the model.
Any unsaved work will be lost.
NVRAM (nonvolatile random-access memory) is a cache of settings specific to your Mac. Resetting NVRAM is safe, however you will need to reset some of your minor customizations, such as volume, time zone, or screen resolution.
If you computer will not respond to any input and appears frozen, press and hold on the Power button until the computer shuts off.
The power button on a Macbook is typically located on or near the keyboard while the power button on a Mac Pro will vary depending on the model.
Any unsaved work will be lost.
If your computer does power on to the Apple logo with a progress bar but does not fully load into the operating system, click the link below for some additional troubleshooting.
Clicking this button will open a new guide that will provide you with steps to resolve your issue.
If you are not getting a loading screen you will need to contact Apple for further assistance.
If you do not have the recovery / install media on USB media or DVD, contact Apple for options of obtaining media
If your computer does power on to the Apple logo with a progress bar but does not fully load into the operating system, click the link below for some additional troubleshooting.
Clicking this button will open a new guide that will provide you with steps to resolve your issue.
If you are not getting a loading screen you will need to contact Apple for further assistance.